Improvement



.i NrTnD STATES PATENT einen,

CLAY CRAWFORD, or nns'r CLEVELAND, onto.

Speciication forming part' of Letters Patent No. 49,728, dated September 5, 1865.

To all whom it may concern:

38e it known that I, CLAY GRAWnoRD,of East Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Steam-Generators, and l do hereby declare that the following is a full and complete description of the construction and operation of the same, reference being had to the accompanying drawings, inaking a part of this specification, in whichlFigure l is a perspective viewot the steamgenerator. Figure 2 is a longitudinal section. Fig. 3 is a view across the fire-place.

Line letters of reierencerefer to like part-s in the several views.

My improvement relates to arranging the fines in the lower part ofthe boiler, below the grate-pipes, and also to incliuing said pipes in the tire-box, for the purpose of causing a current ot' Water to pass continually through the grate-pipes, and producing a more perfect coinbinaiion of the iuel and economical operation of steam.

It represents the boiler; B, the fire-place, the internal structure oi' which is shown. in Figs. 2 and 3. Around the iire-place is a chainber, C, for containing' water, and-in the fire-box are grate-pipes I), inclinedv upward from the iront, as shown in Fig. 2, or they can be inclined in the other direction. These pipes form the grate of the ire-box, and communicate with the chamber C on one side and the boiler on the other. From the tire-box, underneath the grate-pipes., through the lower part of the boiler, extend ues a, for conveying the noncoinhustible gases into the chimney D and to generating steam in the boiler. The upper dues enter the fire-box below the gratepipes, as shown in lig. 2, being in a line or a little above the lowest end oi' the pipes, below which there can be any desired number of ilues for generating steam.

F is an exhaust-pipe in the rear end of the i boiler, as seen in Figs. l and 2, for the ordinary use.

E` is the opening into the fireplace.

The object of having the grate-pipes or tubular bars-b inclined either wayacross the rebox instead of horizontal is to cause a current of water to run continually through the pipes, which is not so readily done when the pipes are horizontal. In this way the grate-pi pes are prevented from burning out so rapidly, the fresh water passing continually through them, the Water being admitted into the lower part oi' theboiler in the ordinary manner. The dra r't `from the lire-box is down around the pipes b,

through the ilues a in the lower part ot the boiler, entering the fines from the grate in the direction of the arrow, being a downward draft or current through the coals on the grate and around the pipes. The principle involved iu this downward draft is that the gas to produce combustion dlstills down through the fuel until il: comes in Contact with the lower stratum of burning coals an d becomes sniiciently heat ed to ignite, so that the smoke and all com bustible gases produced by ignition go through the fire and are consumed, instead otpassing olf as waste products ofvconnbnstion in the ordinary way, being utilized, as specified.

What Iclaiin as niy improvement, and desire to secure by Letters Patent, is

l. So arranging the tubular grate-bars b in relation to the lues a and lire-place B and draft that the products oi' combustion in said iire-place will pass down from the top around the grate-pipes in accordance with the direction ot' the draft, substantially as and for the purpose set forth.

2. The grate-pipes andilues, when arranged in relation to each other and the boiler, sub stantially as and for the purpose set forth.

Witnesses: CLAY CRAWFORD.

W. H. BURRIDGE, A. W McCiLeLLaN 

